Electrical protective system.



W. G. CHAPMAN.

ELECTRICAL PROTECTIVE SYSTEM.

APPHCATION min Ame. 1915.

1,223,255. Patented Apr. 17,1917.

2 SHEETS-SHEET 1.

CR W 6: Ulla "11a u qm'i bnaooeo Q.)

415M f M 4:. v M y attozm W. G. CHAPMAN.

ELECTRICAL PROTECTIVE SYSTEM. APPLICATION mm APILB, ms.

Patented Apr. 17, 1917.

2 SHEETS-SHEET 2.

3mm 6'. Chapman UNITED STATES) ATENT orricii.

winning: a. exam, or mm'rme'rox, wris'r vmemm;

memos; mm SYSTEM.

To. all whom it may concern; 7

Be it known that I, \VILLIAM G. CHAR- MAN, a citizen of the UnitedStates, residing i provide an electrically controlled photographingapparatus which may be arranged at or near the point or objects to'beguarded and protected, and arranged to be automatically' operated by anintruder so as to actuate the camera shutter and simultaneously throwinto action a flash or other light, and also if desired operate awarning alarm or signal.

A further object of the invention is to provide a protective system ofthe character'described wherein special provision is made for securing apredetermined length of exposure in a 'simple, reliable and efficientmanner.

The invention consists of the features of construction, combination andarrangement of parts herein. fully described and claimed,

reference being had to "the accompanying drawings in. which 2-:-

Figure l is a sectional side elevation of a photographing camera system,showing the parts of the system connected therewith.

Fig. 2 is a sectional same.

Fig. 3 is a sectional view of the time limit relay. j

Figs. 4 and 5 are plan and sectional views front elevation of the of theplatform or primary switch.

Fig. 6 is a diagrammatic view of the system in entirety- Y I In carryingmy invention into practice, I

provide a camera 1 having a suitable type" of shutter 1, shown in thepresent instance as a swinging dust-proof shutter-cap carried by anelbow-shaped bracket 2. The bracket 2 has one of its arms fixed to theSpecification of Letters Patent.

employed in the- .in which circuit is alarm device 13 which may bearrangedat,

. closing 'device 16.

shutter pivotally mounted upon a fixed sup- [port 3 at the angle ofintersection of its arms in proximity to'a lever 3 pivoted at one end tothe fixed support 3; The free or roller 3 to engage and depress. thefree arm of the bracket 2.' A spring 2 is fixed at one endto theshutterand at its opposite end to a fixed support. Normally this spring lies ona line in rear of the pivot of the bracket and acts to hold the shutterclosedJ- lVhen, however, the lever 3 is swung downward, the. contactdengages and tilts the bracket downwardly and forwardly, the shutter isopened and the spring shifted forward of said pivot line and exerts itscon- Patented Apr. 1'7, 1917, Application filed April 8,1916. Serial m.seam end of this lever carries a contact pin, stud tractile energy toquickly, open the shutter. I

The parts above described are preferably inclosed in .a dust-proofcasing A, and in practiceany suitable automatic type of flashlightdevice (not shown) may be used for product ing the required illuminationduring the exposure period.

The lever 3 connection with the core or cores of one is coupled by anactuating 1 or more solenoids 6 arranged in a normally open, cameracontrolling circuit including a battery or other source of energy E andcoir ductors 7 and 8 leading from the positive and negative polesthereof to switch contacts 9 and 10, upon the closure of which circuitthe solenoids will be energized to operate the camera shutter for thephotographic action. If'desired, an alarm circuit may be arranged to bethrown into action when the camera shutter is operated, which alarmcircuit may include a battery or other source of energy E and conductors11 and 12 leading from the positive and negative poles thereof to thecontacts 9 and 10, withdisposeda bell or other an alarm stationor otherdistant point for notifying a watchman or others of the intrusion. i

'The circuits referred to are controlled by energizing circuit and agoverning circuit between the same and the camera actuatin and'alarincircuits. The starting or energizing circuit-includes a batteryconductors 14 and 15 a starting or and a primary circuit This primarycircuit closing device is shown in the present in-' stance in the formof a base plate 17 and a orother suitable source of energy B superposeddepressible plateor platform 18, I

stantaneous opening action of the shutter being thereby secured. Inresettin the apparatus, the shutter cap itself may fie closed by hand.

In the use of the apparatus for protective purposes in banks, householdsand other places, the parts of the apparatus will of course be suitablysealed from view and protected against injury, while the camera will beinclosed in a dust-proof casing and arranged so as to be protected fromany possibility of damage by the intruder after operation of theapparatus and the general point of location of the camera has beenindicated. The essential and primary feature of my invention resides inthe provision of an automatic protective system employing a photographiccamera which embodies means for absolutely securing a full exposure ofthe film or plate for the necessary period, whether or not theenergizing circuit is but momentarily closed or kept closed for a longeror shorter period by the continued depression of the switch platform.While the described structure is preferred as one means foncarrying myinvention into practical effect, it is to be understood, the changes inthe construction and arrangement of parts may be made within the scopeof the claims without departing any of the a I claim 1. An apparatus ofthe character described including a shutter actuating circuit, asparking circuit, a relay in said sparking circuit and controllingsaidshutter actuating circuit, a starting circuit, a switch for closing thesparkingcircuit, and means governed by the starting circuit forinstantaneously closing said switch and a suitable time thereafteropening said switch independently of the condition of said startingcircuit.

2. An apparatus of the character described including an actuatingcircuit, a sparking circuit, a relay in said sparking vantages of theinvention.

from thespirit or sacrificing circuit controllin said actuating circuit,a switch in the spar ing circuit, a starting circuit having a circuitclosing device, and means controlled by said circuit for instantaneouslyclosing said switch, said switch closing means having meansindependentof said starting circuit for producing a retarded openingmovement of the switch. I

3. An apparatus of the character described including an actuatingcircuit, a lighting circuit, means in said lighting circuit for openingand closing said actuating circuit, a starting circuit having openingand closing means therein, a switch for closing the sparking'circuit, anautomatically closing switch in the sparking circuit, a solenoid in thestarting circuit for normally holding said switch open and permittingclosing movement thereof when said solenoid is energized, said solenoidhaving a spring retracted core and a lost-motion connection with theswitch, and a retarding device for controlling the retraction of thecore.

4. An apparatus of the character described including an actuatingcircuit, a

sparking circuit, a relay in the s arking circuit controlling theactuating circuit, an automatically closing switch in the sparkingcircuit, a starting circuit, a solenoid in said circuit having a coreslidably connected with the switch and provided with means for norlnallyholdingthe sv'itch from action, said core having operative movementgreater than the extent of closingmovement ot the switch, spring meanstensioned by the operating movement of the core for returning said coreand switch to normal position, and

a retarding device controlling said core to reduce the speed ofretraction thereof.

In testimony whereof I ailix my signature in presence of two witnesses.

ILLIAM G. CHAPMAN.

Witnesses F. L. HERSEY, CARNEY M. LAYNE.

